Key to species and known life stages of pupal Skusella Freeman

1 Pleural fringe on posterior of III and all of IV–VIII (Figs 5 A, 5C, 6 A –C).......................................... 2

- Pleural fringe restricted to VIII (Fig. 5B)................................................................... 6

2 Spinulation on T II–IV barely extending to the lateral longitudinal row of muscle marks anteriorly; thus, spinule field narrower anteriorly than posteriorly (Figs 5 A, 5C, 6 A)................................................................ 3

- Spinulation on T II–IV extending beyond lateral longitudinal row of muscle marks anteriorly; thus field wider anteriorly than posteriorly (Figs 6B–C)................................................................................. 5

3 With 25 or more hooklets on T II, occupying> ¼ of segment width (Fig. 6 A)..................... S. silingae Tang sp. n.

- With 20 or fewer hooklets on T II, occupying about 1/5 of segment width (Fig. 5 A)................................. 4

4 Tergites VII and VIII spinulose (Fig. 5 A)................................................... S. subvittata (Skuse)

- Tergites VII and VIII bare (without spinules) (Fig. 5C)........................................ S. freemani Harrison

5 Pleurae II–IV bare, spinulose only on anterolateral of pleurae V–VII (Fig. 6B). Sternite I bare............ S. sp. ‘Limuling’

- At least pleurae II–IV spinulose (Fig. 6C). Sternite I with anterolateral and median spinule patches (Fig. 4E) S. sp. ‘Sanyatang’

6 Tergites II–VI spinulation extending to apophyses on III–VII (Fig. 4F)............................ S. sp. ‘Jianfengling'

- Tergites II–VI with spinulation not reaching apophyses (Fig. 5B)............................... S. pallidipes Freeman